How to set the From email address for mailx command

Question

I am working on a KornShell  ksh  script running on a Solaris server that will send out an email when and error condition is met   I am sending the email via mailx    Question   How do I set the  From  email address on the mailx command   Current Code   echo   msg txt    mailx -s  Script Failure    to email    Note   The command works fine  however  the  From  is the name of the user I am running the script as and I would like for this to another email address   How would I accomplish this

User · Answer

On Ubuntu Bionic 18 04  this works as desired     echo -e  testing email via yourisp com from command line n nsent on    date     mailx --append  FROM Foghorn Leghorn  lt fleghorn yourisp com gt   -s  test cli email   date   -- recipient acme com

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You can use the  -r  option to set the sender address   mailx -r me example com -s

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On debian where bsd-mailx is installed by default  the -r option does not work  However you can use mailx -s subject recipient abc com -- -f sender abc com instead  According to man page  you can specify sendmail options after --

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The package nail provides an enhanced mailx like interface  It includes the -r option   On Centos 5 installing the package mailx gives you a program called mail  which doesn t support the mailx options

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In case you also want to include your real name in the from-field  you can use the following format  mailx -r  me example com  My Name   -s  My Subject        If you happen to have non-ASCII characters in you name  like My AE  oe  aa        C3 86      C3 B8      C3 A5   you have to encode them like this   mailx -r  me example com  My   utf-8 Q AE C3 86oe C3 B8aa C3 A5     -s  My Subject        Hope this can save someone an hour of hard work research

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On macOS Sierra  creating    mailrc with smtp setup did the trick   set smtp-use-starttls set smtp smtp   smtp gmail com 587 set smtp-auth login set smtp-auth-user youremail gmail com set smtp-auth-password yourpass   Then to send mail from CLI   echo  your message    mail -s  your subject  to email gmail com

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The  -r  option is invalid on my systems  I had to use a different syntax for the  From  field   -a  From  Foo Bar  lt foo bar someplace com gt

User · Answer

Just ran into this syntax problem on a CentOS 7 machine   On a very old Ubuntu machine running mail  the syntax for a nicely composed email is  echo -e   body    mail -s   subject  -a  From  Sender Name  lt  sender gt     recipient    However on a CentOS 7 box which came with mailx installed  it s quite different   echo -e   body    mail -s   subject  -S  from Sender Name  lt  sender gt     recipient    Consulting man mail indicates that -r is deprecated and the  From  sender address should now be set directly using -S  variable value       In these and subsequent examples  I m defining  sender as  Sender Name  lt sender address domain tld gt   and  recipients as  recipient name domain tld  as I do in my bash script    You may then find  as I did  that when you try to generate the email s body content in your script at the point of sending the email  you encounter a strange behaviour where the email body is instead attached as a binary file   ATT00001 bin    application octet-stream  or  noname   depending on client    This behaviour is how Heirloom mailx handles unrecognised   control characters in text input   More info  https   access redhat com solutions 1136493  which itself references the mailx man page for the solution    To get around this  I used a method which pipes the generated output through tr before passing to mail  and also specifies the charset of the email   echo -e   body    tr -d   r   mail -s   subject  -S  from  sender  -S  sendcharsets utf-8 iso-8859-1    recipients    In my script  I m also explicitly delaring the locale beforehand as it s run as a cronjob  and cron doesn t inherit environmental variables    LANG  en GB UTF8    export LANG      An alternate method of setting locales for cronjobs is discussed here   More info on these workarounds via https   stackoverflow com a 29826988 253139 and https   stackoverflow com a 3120227 253139

[shell] How to set the From email address for mailx command?

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